/Engine/Source/Runtime/AdvancedWidgets/Public/Widgets/SRadialSlider.h
Called when navigation is requested e.g. Left Joystick, Direction Pad, Arrow Keys can generate navigation events.
virtual [FNavigationReply](API\Runtime\SlateCore\Input\FNavigationReply) OnNavigation ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & MyGeometry, const [FNavigationEvent](API\Runtime\SlateCore\Input\FNavigationEvent) & InNavigationEvent )